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valium online call-back mini HOWTO by Pawel Skonecki, stona@kft.umcs.lublin.pl v2.1a, 2001-10-06 This document valium online describes how to set up call-back by using the Linux system and modem. I would like to thank Anna valium online or her patience. ______________________________________________________________________ Table of valium online ontents 1. Introduction 1.1 OPINION 1.2 PUBLISHING 2. Procedure 2.1 PART I: Net at ho valium online e ? 2.2 PART II: The first steps with modem. 2.3 PART III Call Linux 2.4 PART IV Linux valium online alls us 2.5 PART V Summary ___________________________________________________________________ valium online __ 1. Introduction 1.1. OPINION I will be waiting for all opinions about this document. I have valium online tried to gather information as complete as possible. Tell me when your find any mistakes. I'll be valium online grateful to people who will send me any suggestions or corrections. Their contributions will make valium online his document better. I don't mind answering your questions but I'd rather you read the whole art valium online cle first. 1.2. PUBLISHING This document can by published under the conditions of Linux Documen valium online ation Project. Get in touch with the author if you can't get this license. This document is free. valium online 2. Procedure 2.1. PART I: Net at home ? Most of us use the Internet in a place of work. Howeve valium online we offen need the net at home or outside the place of work. It may be possible that the work fro valium online home is cheaper then from a company building. I think that the best solution is to install call-b valium online ck software on the Linux server. Call-back makes it possible to re-call index number at the cost valium online f the company. I'll try to present how it works. An entitled person who calls the modem is varied valium online or the first time in Linux server. Then on the user's side the "hang up modem" is switched on. A valium online the same time Linux calls the user. User is verified again. We have connection and the server is valium online harged. The user pays only for the initiation of the connection. The double verification and extra valium online options in the call-back program unable the unsuitable persons to charge our bill. We can restric valium online the access to the connection only to corporation network or the Internet. Call-back is very flex valium online ble. Below, I'll try to present the configuration of a call-back server on Linux system and I'll valium online how you how to set up your computer for re- calling the connection. I don't describe configuration valium online of ISDN call- back because I don't use ISDN in my connection to the Internet. If you set call-ba valium online k on ISDN send me your configuration. I had some problem when I changed my kernel from 2.2.x to 2 valium online 4.x. I will describe new option for a new kernel. Remember that if you change your kernel for hig valium online version you will have to change pppd, too. I don't create a new section for description of new p valium online ssibility in kernels 2.4.x but I write a new configurations in old section. I would like to apolo valium online ise to people who asked me about options for new kernels. I didn't have time to write a new vers valium online on of HOW-TO. I have changed my job and place of liveing. Sorry. 2.2. PART II: The first steps w valium online th modem. The administrators prefer different modem but while buying a modem we should remember c valium online rtain guidelines: · If you have USR WinModems see Linmodem-HOWTO. · The externale modem is mous valium online flexible you have more place inste your computer. · The internal modem with ISA slot is bett valium online r then the are with PCI slot (you can use your PCI slot for something different ) · Don't use valium online Plug modem see Plag-and-Play-HOWTO. When we have the suitable modem we have to set it up in our sy valium online tem. We have to check on which com our modem is. Then we have to make a symbolic link to this har valium online ware and /dev/modem. For example, if we have the modem for the 2nd com we write: ln -s /dev/cua1 valium online dev/modem We check it lrwxrwxrwx 1 root uucp 9 Sep 19 19:10 /dev/modem -> /dev/cua1 If we have t valium online e modem on different com we have to remember that /dev/cua0 is com1 /dev/cua1 is com2 /dev/cua2 valium online s com3 /dev/cua3 is com4 For new kernels: /dev/ttyS0 is com1 /dev/ttyS1 is com2 /dev/ttyS2 is valium online om3 /dev/ttyS3 is com4 Now, we check our configuration using the program minicom. 2.3. PART III valium online Call Linux The first step to make the call-back on Linux accessible is to set up a suitable param valium online ters in kernel. Then we check whether our kernel serves the protocol ppp. If you don't have ppp in valium online your kernel or in module you will have to compile your kernel and add ppp. You will find more inf valium online rmation in Kernel-HOWTO.In the kernels 2.4.x series you have to mark follow options: CONFIG_PPP=m valium online # CONFIG_PPP_MULTILINK is not set CONFIG_PPP_ASYNC=m CONFIG_PPP_SYNC_TTY=m CONFIG_PPP_DEFLATE=m CO valium online FIG_PPP_BSDCOMP=m After compilation you have to add some lines for /etc/modules.conf alias /dev/ valium online pp ppp_generic alias char-major-108 ppp_generic alias tty-ldisc-3 ppp_async alias t valium online y-ldisc-14 ppp_synctty alias ppp-compress-21 bsd_comp alias ppp-compress-24 ppp_deflate alias ppp-compress-26 ppp_deflate You can't forget that you need new pppd demon for kernels 2.4.x (for me it was ppp-2.4.0 this ppp has some mistake you have to get latest from ftp.samba.org in /pub/ppp ). OK. We have a good kernel. Now, we have to set up the software to our system. The call-back program is a part of mgetty-sendfax and ppp. You will find it all in your distribution. Because the call-back system has double verification we create a user who will be running ppp on the side of server. In /etc/passwd you have new user and you have to change their shall. pppuser:klkIOM89mn65H:230:PPP Dialin:/home/pppuser:/etc/ppp/ppplogin I changed the above line for kernel 2.4.x this line in /etc/passwd (I
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